| Year | Count |
|---|---|
| 1964 | 5 |
| 1966 | 10 |
| 1980 | 6 |
| 1982 | 15 |
| 1988 | 28 |
| 1989 | 19 |
| 1991 | 31 |
| 1992 | 77 |
| 1993 | 96 |
| 1994 | 5 |
| 1994 | 84 |
| 1995 | 8 |
| 1995 | 101 |
| 1996 | 62 |
| 1997 | 87 |
| 1998 | 123 |
| 1999 | 73 |
| 2000 | 70 |
| 2001 | 107 |
| 2002 | 86 |
| 2003 | 62 |
| 2004 | 62 |
| 2005 | 62 |
| 2006 | 56 |
| 2007 | 49 |
| 2008 | 87 |
| 2009 | 35 |
| 2010 | 36 |
| 2011 | 33 |
| 2012 | 44 |
| 2013 | 34 |
| 2015 | 18 |
| 2017 | 7 |
| 2018 | 5 |